JP3244940U - drive unit - Google Patents

Abstract

The present invention provides a drive unit with wide ratio coverage. A drive unit (100) includes an electric motor (2), a drive pulley device (3), a belt (4), and a driven pulley device (5). The driven pulley device receives torque from the drive pulley device, is configured to rotate in a forward rotation direction and a backward rotation direction, and has a fixed sheave, a movable sheave, a fixed boss, a movable boss, and a pin. The movable sheave is arranged opposite to the fixed sheave. A fixed boss extends axially from the fixed sheave. The movable boss has an engagement groove. The engagement groove penetrates in the radial direction and extends in the axial direction. A movable boss extends axially from the movable sheave. The movable boss is arranged radially outward with respect to the fixed boss. The pin projects radially outward from the fixed boss. The pin is disposed within the engagement groove. The engagement groove has a first surface and a second surface. The first surface faces the forward rotation direction and extends parallel to the axial direction. The second surface faces the reverse rotation direction. [Selection diagram] Figure 1

Description

The present invention relates to a drive unit.

In recent years, motorcycles using electric motors as a driving source have been proposed. For example, Patent Document 1 discloses a motorcycle in which a swing arm supports a drive unit including an electric motor.

Japanese Patent Application Publication No. 2011-152901

There is a desire to widen the ratio coverage in a drive unit for a motorcycle or three-wheeled vehicle using an electric motor as a drive source. Therefore, an object of the present invention is to provide a drive unit that can widen the ratio coverage.

The drive unit according to the first aspect includes an electric motor, a drive pulley device, and a driven pulley device. The drive pulley device is connected to an electric motor. Torque is transmitted to the driven pulley device from the drive pulley device. The driven pulley device is configured to rotate in a forward rotational direction and a backward rotational direction. The driven pulley device has a fixed sheave, a movable sheave, a fixed boss, a movable boss, and a pin. The movable sheave is arranged opposite to the fixed sheave. A fixed boss extends axially from the fixed sheave. The movable boss has an engagement groove. The engagement groove penetrates in the radial direction and extends in the axial direction. A movable boss extends axially from the movable sheave. The movable boss is arranged radially outward with respect to the fixed boss. The pin projects radially outward from the fixed boss. The pin is disposed within the engagement groove. The engagement groove has a first surface and a second surface. The first surface faces the forward rotation direction and extends parallel to the axial direction. The second surface faces the reverse rotation direction.

According to this configuration, since the pulley device is attached to the electric motor, the ratio coverage can be widened. Furthermore, since the drive source of the drive unit is an electric motor, the vehicle can be moved backward by rotating the electric motor in the opposite direction. Here, since the first surface extends parallel to the axial direction, even if the driven pulley is reversely rotated to move the vehicle backward, the distance between the fixed sheave and the movable sheave does not increase. Therefore, the torque output by the electric motor can be stably transmitted to the drive wheels.

The drive unit according to the second aspect is configured as follows in the drive unit according to the first aspect. The second surface extends parallel to the axial direction.

The drive unit according to the third aspect is configured as follows in the drive unit according to the first aspect. The second surface extends obliquely in the axial direction.

The drive unit according to the fourth aspect is configured as follows in the drive unit according to any one of the first to third aspects. The pin has a flat portion facing the first surface.

The drive unit according to the fifth aspect is configured as follows in the drive unit according to any one of the first to fourth aspects. The movable boss extends from the movable sheave toward the first axial side. The pin is arranged on the first axial side within the engagement groove.

According to the present invention, ratio coverage can be widened.

A cross-sectional view of the drive unit. FIG. 3 is a sectional view of the driven pulley device. FIG. 3 is a side view of a second fixed boss, a movable boss, and a pin. FIG. 7 is a diagram of an engagement groove according to a modification. FIG. 7 is a diagram of a pin according to a modification.

Hereinafter, the drive unit 100 according to the present embodiment will be described with reference to the drawings. In the following description, unless otherwise specified, the axial direction is the direction in which the rotation axis O of the driven pulley device 5 extends, and the circumferential direction is the circumferential direction of a circle centered on the rotation axis O. , the radial direction is the radial direction of a circle centered on the rotation axis O. The forward rotation direction means the direction in which each member rotates when moving the vehicle forward. Moreover, the reverse rotation direction means the direction in which each member rotates when the vehicle is reversed.

<Drive unit>
As shown in FIG. 1, the drive unit 100 includes an electric motor 2, a drive pulley device 3, a belt 4, and a driven pulley device 5. The drive unit 100 is mounted on a motorcycle or a tricycle. The drive unit 100 is configured to drive drive wheels (not shown).

<Electric motor>
Electric motor 2 functions as a drive source for drive unit 100 . The electric motor 2 is, for example, an AC synchronous motor. Note that the drive unit 100 has only the electric motor 2 as a drive source. That is, drive unit 100 does not have an internal combustion engine as a drive source. Although the drive unit 100 does not have an internal combustion engine in this embodiment, it may have an internal combustion engine used for power generation.

The electric motor 2 has a motor case 21 , a stator 22 , a rotor 23 , and a first output shaft 24 . The electric motor 2 in this embodiment is a so-called inner rotor type motor. The electric motor 2 has an inverter (not shown) for controlling the rotation speed of the electric motor 2.

Motor case 21 is fixed to pulley case 30 and cannot rotate. A stator 22 and a rotor 23 are housed within this motor case 21 .

Stator 22 is fixed to the inner peripheral surface of motor case 21 . Stator 22 is non-rotatable. The rotor 23 is rotatably arranged. The rotor 23 is arranged inside the stator 22. The stator 22 is spaced apart from the rotor 23.

The first output shaft 24 rotates integrally with the rotor 23. The first output shaft 24 extends towards the drive pulley device 3 . The first output shaft 24 is rotatably supported by a plurality of bearings.

<Drive pulley device>
The drive pulley device 3 is connected to the electric motor 2 . That is, the torque output by the electric motor 2 is transmitted to the drive pulley device 3. The drive pulley device 3 includes a first fixed sheave 31, a first movable sheave 32, a first fixed boss 33, and a plurality of weight rollers 34.

The first fixed sheave 31 and the first movable sheave 32 are arranged to face each other. The first fixed sheave 31 is immovable in the axial direction of the drive pulley device 3. On the other hand, the first movable sheave 32 is movable toward and away from the first fixed sheave 31.

The first fixed boss 33 extends from the first fixed sheave 31 toward the electric motor 2 . The first fixed boss 33 rotates integrally with the first fixed sheave 31. Further, the first fixed boss 33 rotates integrally with the first movable sheave 32. The first movable sheave 32 slides on the first fixed boss 33 in the axial direction of the drive pulley device 3 . The first fixing boss 33 has a cylindrical shape. The first output shaft 24 extends within the first fixed boss 33 . The first fixed boss 33 rotates integrally with the first output shaft 24. Note that the first fixed boss 33 and the first output shaft 24 may be connected via another member.

The plurality of weight rollers 34 are configured to press the first movable sheave 32 toward the first fixed sheave 31. Specifically, when the electric motor 2 rotates and the drive pulley device 3 rotates, centrifugal force is generated in the weight roller 34, and the weight roller 34 moves radially outward of the drive pulley device 3. As a result, the weight roller 34 presses the first movable sheave 32 toward the first fixed sheave 31.

<Belt>
The belt 4 is wrapped around a driving pulley device 3 and a driven pulley device 5. The belt 4 transmits torque between the drive pulley device 3 and the driven pulley device 5.

<Driven pulley device>
As shown in FIG. 2, the driven pulley device 5 includes a second fixed sheave 51 (an example of a fixed sheave), a second fixed boss 52 (an example of a fixed boss), a second movable sheave 53 (an example of a movable sheave), a movable It has a boss 54, a spring 55, a cover 56, a support member 57, a nut 58, and a plurality of pins 59. Torque is transmitted to the driven pulley device 5 from the drive pulley device 3. That is, torque from the driving pulley device 3 is transmitted to the driven pulley device 5 via the belt 4. The driven pulley device 5 is configured to rotate around the rotation axis O in a forward rotation direction and a backward rotation direction. That is, as the electric motor 2 rotates in the forward rotation direction, the driven pulley device 5 rotates in the forward rotation direction. As a result, the vehicle moves forward. Further, as the electric motor 2 rotates in the backward rotation direction, the driven pulley device 5 rotates in the backward rotation direction. As a result, the vehicle moves backward.

The second fixed sheave 51 is arranged to rotate around the rotation axis O. The second fixed sheave 51 is fixed so as not to move in the axial direction.

The second fixed sheave 51 has a disk shape. The opposing surface 511 of the second fixed sheave 51 is inclined away from the second movable sheave 53 toward the outside in the radial direction. Note that the facing surface 511 of the second fixed sheave 51 is a surface facing the second movable sheave 53.

The second fixed boss 52 has a cylindrical shape and extends from the second fixed sheave 51 in the axial direction. Specifically, the second fixed boss 52 extends from the second fixed sheave 51 to the first axial side (the right side in FIG. 2). The second fixed boss 52 rotates integrally with the second fixed sheave 51. In this embodiment, the second fixed boss 52 is formed of a separate member from the second fixed sheave 51. The second fixed boss 52 rotates integrally with the second fixed sheave 51 by being fixed to the second fixed sheave 51. Note that the second fixed boss 52 and the second fixed sheave 51 may be constituted by one member.

The tip portion 521 of the second fixing boss 52 has a smaller outer diameter than other portions. A threaded portion is formed on the outer circumferential surface of the tip portion 521 of the second fixing boss 52 . A support member 57 is attached to this threaded portion. Further, in order to fix the support member 57, a nut 58 is screwed onto the threaded portion. Note that the tip portion 521 of the second fixing boss 52 is an end portion on the first side in the axial direction.

The second output shaft 60 extends inside the second fixed boss 52 in the axial direction. The second output shaft 60 is, for example, a shaft for transmitting torque to drive wheels. The second output shaft 60 and the second fixed boss 52 rotate together. Specifically, the second output shaft 60 has a spline end fitted to the second fixed boss 52.

The second movable sheave 53 is arranged to rotate around the rotation axis O. The second movable sheave 53 is arranged to face the second fixed sheave 51 in the axial direction. The second movable sheave 53 is arranged on the first side in the axial direction with respect to the second fixed sheave 51. The second movable sheave 53 is arranged to move in the axial direction. The second movable sheave 53 moves toward and away from the second fixed sheave 51 by moving in the axial direction.

The second movable sheave 53 has a disc shape. The opposing surface 531 of the second movable sheave 53 is inclined away from the second fixed sheave 51 as it goes radially outward.

The facing surface 531 of the second movable sheave 53 is a surface facing the second fixed sheave 51. The opposing surface 511 of the second fixed sheave 51 and the opposing surface 531 of the second movable sheave 53 are opposed to each other with an interval therebetween. A V-groove is formed by the opposing surface 511 of the second fixed sheave 51 and the opposing surface 531 of the second movable sheave 53. By moving the second movable sheave 53 in the axial direction, the groove width of the V groove changes. A belt 4 is placed within this V-groove. Note that the belt 4 is held between the facing surface 511 of the second fixed sheave 51 and the facing surface 531 of the second movable sheave 53.

The movable boss 54 extends from the second movable sheave 53 in the axial direction. Specifically, the movable boss 54 extends from the second movable sheave 53 toward the first side in the axial direction. The movable boss 54 rotates integrally with the second movable sheave 53. Furthermore, the movable boss 54 moves in the axial direction integrally with the second movable sheave 53. In this embodiment, the movable boss 54 and the second movable sheave 53 are each formed of separate members and are fixed to each other. Note that the movable boss 54 and the second movable sheave 53 may be formed of one member.

The movable boss 54 has a cylindrical shape. The movable boss 54 is arranged radially outward with respect to the second fixed boss 52. That is, the second fixed boss 52 extends inside the movable boss 54.

The movable boss 54 is made of metal, for example. Specifically, the movable boss 54 is made of steel or aluminum alloy. More specifically, the movable boss 54 is formed of at least one type selected from the group consisting of carbon steel and alloy steel.

FIG. 3 is a diagram showing the second fixed boss 52, the movable boss 54, and the pin 59. As shown in FIGS. 2 and 3, the movable boss 54 has a plurality of engagement grooves 541. For example, in this embodiment, three engagement grooves 541 are provided. The engagement grooves 541 are arranged at intervals from each other in the circumferential direction. Preferably, each engagement groove 541 is arranged at equal intervals in the circumferential direction.

Each engagement groove 541 penetrates the movable boss 54 in the radial direction. The engagement groove 541 extends in the axial direction.

Each engagement groove 541 has a first surface 542 and a second surface 543. Specifically, the surface defining the engagement groove 541 has a first surface 542 and a second surface 543. The first surface 542 and the second surface 543 are opposite to each other.

The first surface 542 faces the forward rotation direction. That is, the first surface 542 is a surface facing the forward rotation direction among the surfaces defining the engagement groove 541. Therefore, the first surface 542 is pressed by the pin 59 during backward movement, particularly during acceleration during reverse movement.

The first surface 542 extends parallel to the axial direction. That is, it extends in a direction perpendicular to the forward rotational direction. Therefore, the movable boss 54 does not move in the axial direction due to the first surface 542 being pressed by the pin 59. Note that the first surfaces 542 of all the engagement grooves 541 extend parallel to the axial direction.

The second surface 543 faces the backward rotation direction. That is, the second surface 543 is a surface facing in the backward rotation direction among the surfaces defining the engagement groove 541. Therefore, the second surface 543 is pressed by the pin 59 during forward movement, especially during forward acceleration.

The second surface 543 extends parallel to the axial direction. That is, it extends in a direction perpendicular to the forward rotational direction. Therefore, the movable boss 54 does not move in the axial direction due to the second surface 543 being pressed by the pin 59.

The movable boss 54 has a pair of mounting grooves 544. The mounting groove 544 extends in the circumferential direction on the outer peripheral surface of the movable boss 54. The attachment groove 544 is annular. The pair of mounting grooves 544 are spaced apart from each other in the axial direction. The engagement groove 541 is arranged between the pair of attachment grooves 544. An O-ring 545 is attached to this attachment groove 544.

Each pin 59 protrudes radially outward from the second fixing boss 52 and is disposed within each engagement groove 541. Although not particularly limited, for example, the distance between the pin 59 and the first surface 542 is about 0 to 0.5 mm. Note that the same applies to the distance between the pin 59 and the second surface 543.

When the drive unit 100 is not operating, that is, when the vehicle is stopped, the pin 59 is disposed within the engagement groove 541 on the first axial side. Note that being disposed on the first side in the axial direction within the engagement groove 541 means being disposed in a region on the first side with respect to the center of the engagement groove 541 in the axial direction. Each pin 59 has the same position in the axial direction. That is, each pin 59 is arranged on the same circumference. The pin 59 is made of carbon steel for machine structures, alloy steel for machine structures (SCM, etc.), sintered material, or the like.

As shown in FIG. 2, the spring 55 is disposed between the second movable sheave 53 and the support member 57 in a compressed state. The spring 55 urges the second movable sheave 53 in the axial direction. Specifically, the spring 55 urges the second movable sheave 53 toward the second fixed sheave 51 in the axial direction. That is, the spring 55 urges the second movable sheave 53 toward the second side in the axial direction. As a result, the second fixed sheave 51 and the second movable sheave 53 sandwich the belt 4. The spring 55 can be, for example, a coil spring. The spring 55 is arranged radially outward of the movable boss 54 so as to surround the movable boss 54.

The cover 56 has a cylindrical shape. The cover 56 is arranged radially outward with respect to the movable boss 54. That is, the movable boss 54 extends inside the cover 56. The cover 56 is arranged between the movable boss 54 and the spring 55 in the radial direction.

The cover 56 has a cover main body portion 561 and a flange portion 562. The cover main body portion 561 is configured to cover the movable boss 54. Specifically, the cover main body portion 561 is configured to cover the engagement groove 541. A pair of O-rings 545 seal between the cover main body portion 561 and the movable boss 54 . Therefore, grease can be sealed within the engagement groove 541. Further, a pair of sealing members 546 are provided to seal between the second fixed boss 52 and the movable boss 54. Each seal member 546 is, for example, a lip seal.

The flange portion 562 protrudes radially outward from the end of the cover body portion 561. Specifically, a flange portion 562 is formed at the end portion of the cover body portion 561 on the second axial side. The flange portion 562 is arranged between the spring 55 and the second movable sheave 53 in the axial direction. In this way, since the flange portion 562 is sandwiched between the spring 55 and the second movable sheave 53, the cover 56 does not move in the axial direction with respect to the movable boss 54. That is, the cover 56 moves integrally with the movable boss 54.

[Modified example]
Although the embodiments of the present invention have been described above, the present invention is not limited to these, and various changes can be made without departing from the spirit of the present invention. Note that the following modifications can basically be applied at the same time.

(a) In the above embodiment, both the first surface 542 and the second surface 543 extend parallel to the axial direction, but the configuration of the engagement groove 541 is not limited to this. For example, as shown in FIG. 4, the first surface 542 may extend parallel to the axial direction, while the second surface 543 may extend obliquely to the axial direction. Specifically, the second surface 543 faces the backward rotation direction and is inclined so as to face the first side in the axial direction. Since the second surface 543 is inclined in this manner, the pin 59 presses the second surface 543 toward the second side in the axial direction during forward acceleration. As a result, the second movable sheave 53 moves in a direction approaching the second fixed sheave 51, and can firmly sandwich the belt 4.

(b) In the above embodiment, the pin 59 has a cylindrical shape, but the shape of the pin 59 is not limited to this. For example, as shown in FIG. 5, the pin 59 may have a first flat portion 591. The first plane portion 591 faces the first surface 542. Note that the pin 59 may have a second flat portion 592. The second plane portion 592 faces the second surface 543. In this way, the pin 59 may have a prismatic shape.

2 : Electric motor 3 : Drive pulley device 5 : Driven pulley device 51 : Second fixed sheave 52 : Second fixed boss 53 : Second movable sheave 54 : Movable boss 541 : Engagement groove 542 : First surface 543 : Second Surface 59: Pin 591: First plane portion 100: Drive unit

Claims (5)

electric motor and
a drive pulley device connected to the electric motor;
a driven pulley device configured to receive torque from the driving pulley device and rotate in a forward rotation direction and a backward rotation direction;
Equipped with
The driven pulley device is
a fixed sheave;
a movable sheave arranged opposite to the fixed sheave;
a fixed boss extending axially from the fixed sheave;
a movable boss having an engagement groove penetrating in the radial direction and extending in the axial direction, extending in the axial direction from the movable sheave and disposed on the outside in the radial direction with respect to the fixed boss;
a pin that protrudes radially outward from the fixed boss and is disposed within the engagement groove;
has
The engagement groove has a first surface facing the forward rotation direction and extending parallel to the axial direction, and a second surface facing the backward rotation direction.
drive unit.
The second surface extends parallel to the axial direction.
The drive unit according to claim 1.
the second surface extends obliquely in the axial direction;
The drive unit according to claim 1.
The pin has a flat portion facing the first surface,
The drive unit according to claim 1.
The movable boss extends from the movable sheave toward a first side in the axial direction,
the pin is arranged on the first axial side within the engagement groove;
The drive unit according to claim 1.

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